Spark-plug.



C. MEYER.

SPARK PLUG. 7 APPLICATION FILED NOV. 9,1912.

Patented Sept. 1, 1914.

, wmmw WW p & $6M! m who M44134 CHARLES F. MEYER, OF BRIDGEPORT, CONNECTICUT.

SPARK-PLUG.

iltllhlllld.

Specification of Letters .Patent.

Patented Sept. 1,1314.

Application filed November 9, 12. Serial No. 730,302.

of plug which is designed to be inserted in or removed from the engine cylinders as occasion may require.

It is the purpose of my invention to generally improve and simplify the construction of spark plugs of this class and particularly to produce a plug wherein the insulation or breakable parts thereof may be removed and replaced withoutthe necessity of disconnecting the remainder. or metal portions of the plug; to form the said insulating parts in a simple manner so that they may be produced inexpensively and can readily be assembled with the other parts of the plug.

V ith these and other objects in View the invention resides and consists in the constructions and novel combination and arrangement of parts hereinafter more fully described, illustrated in the accompanying drawings, and pointed out in the claim hereto appended, it being understood that various changes in the form, proportion, size and minor details of construction within the scope of the claim may be resorted to without departure from the spirit or sacrificing any of the advantages of the. invention.

Similar characters of reference denote like or corresponding parts throughout the several figures of the accompanying drawings forming a and upon which,

Figure 1, shows a side elevation of my improved spark plug complete: Fig; 2, is a central vertical longitudinal section of the same. Fig. 3, shows a detached top end and side View respectively, of the upper or out;

.' wardly disposed insulating member of the plug. Fig.- 4, is a detached plan and side view respectively of the inner. porcelain in sulating member in which the lower end portion of the centrally arranged contact rod is mounted, and, Fig. 5, is a detached" plan and side view respectively of a packing part of this specification,-

ring employed intermediate of the outer insulating member and the attached nut for holding the same in place.

Referring in detail to the characters of reference marked upon the drawings 10 represents the body of the plug, the lower end of which is cylindrically formed'and provided with an external thread 11' whereby the plug may be removablyplaced in posi tion in an engine cylinder. A central longitudinal opening 12 is formed-in this body to receive the insulating members 13 and 14 which-in turn support the metal contact rods 15 and 15. The insulating member 14;- is provided with an annular shoulder'17 which rests upon the annular flange 17 surround .ing the smaller end of the opening 12 and in a way to allow the reduced extensionof I said insulation to project beyond the end of the body to insulatively support the sparking end 18 of the metal rod pin 15. The

said insulating member 1d is further pro vided with an annular flange 16 surrounding its upper end portion which rests upon a shoulder 20 formed in the side walls of the opening 12. This construction obviously permits the said insulating member 1 to be conveniently dropped'in from the larger open end of the body of the plug and to promptly seat itself upon the said shoulders and against which it is firmly secured through the medium of the connected parts which will further be explained.

. The metal rod 15 which is mounted in the upper insulating member 13 is provided with an enlargement 21 that forms a shoulder to support the insulating member 13 and which also engages and is seated upon the head 18 of the lower rod 15. The insulating members are thus supported at a proper distance apart and in ,a manner which does not allow the said shoulder and head to come in contactwith the inner avails; of. the body. The

upper insulating member 13 is provided with an annular peripheral shoulder 22 upon which is mounted the annular packing ring 23. The upper edge of the ring is engaged by the external inclosing nut 24 that is threadably attached to the outer peripheral end portion of the plug body. A ferrule 25 is suitably secured to the upper end of the insulating member 13 and likewise engages and surrounds the out wardly extended portion of the metal contact 'rod 15. The said rod at this point is threaded as shown to receive the binding nut 26 whereby a terminal end of a wire con-o nection 27'may be securedto the plug and electrically connected with the metal rod 15 before' mentioned; A second sparking---pin 2S'is suitably secured in the'lower end of the ds-9 fi ep u andihesi fi free n Port o s disposed inward at a angle so as to terminate adjacent to the free end18 0f the" rod 15 in the usual manner. Y

From the foregoing construction it will he noted that m design of plug is such-ias' will permit of the removal fif' desired, of the'in ternal parts of the plug by detaehingthe nut 26 and withoutketiioving theplug proper 'ends of the'easing, an insulating member inserted in-fthe easing and having integral shoulders bearing'on the shoulders of the casingand having a rounded inner end projeeting through the inner end of the casing and forming a deflecting surface, a sparking pin on the inner end of the casing, 21 sparking rodextending through the casing and slidable through the insulating member and having its inner end disposed near the end of thesparking pin, a member on. said rod bearing against"the outer end ofthe in- -"sula'ring member, a second insulating men};

.ber surrounding'fsaid -rod and "bearing against 831d member, aj Packm sleeve surround ng said second "insulat1ng"melnber and projecting slightly from the outer end 0f the casing,' said second insulating mem' 1 her extendingeutw'ardly o f'the casing; a nut" threaded externally on the I outer end ofgth'e casing sleeveand' adapted-"t0 hold the first insul'ating member *seated aga-inst the casing-shout ders,- said second insulating niemberprojct ing through said nut,'an'd means-for adjust ing the rod in the second insulating member. Signed at Bridgeport in. the county jof Fairfield and State of Connecticut this 4th day of NoveinberA. D., 1912.

GHA'RLES F. MEYER. 'lVit-nesse's:

C. M. NEWMAN,

RUTH Wonm'zn.

Copies of this patent may he obtained for five cents each, by addressing the Commissioner of Patents. Washington 20:0."

and bearing against the packing- 

